Abstract
Organic Rankine Cycle (ORC) thermodynamic optimization is of critical importance while developing new plants. Optimization procedures may be imed at the highest efficiency as well as cost or sizing minimization. Optimization process is generally carried out for plant nominal rating. At the same time, part-load operation has to be carefully considered in case of waste heat recovery from flue gases coming from internal combustion engines or gas turbines. Gas mass flow and temperature variations are specific to this application, significantly influencing ORC plant performance. Secure prediction of part-load operation is of particular importance for assessment of plant power output, providing stability and safety and utilizing proper control strategy. In this paper design and off-design cycle simulation model is proposed. Off-design performance of the ORC cycle recovering waste heat from gas turbine unit installed at gas compressor station is considered. Major factors affecting system performance are outlined.
Highlights
Waste heat recovery is a growing market with an upward trend of new plants construction as can be seen into the Organic Rankine Cycle (ORC) worldwide map [1]
An ORC cycle for waste heat recovery from gas turbine unit at gas compression station is considered in the current paper, which comprehensive description and justification of the conceptual design was provided by Zabelin et al [12]
Part-load operation and wide range of ambient temperatures result in significant variation of mass flow rate and temperature of flue gases, directly influencing ORC efficiency and power output
Summary
Waste heat recovery is a growing market with an upward trend of new plants construction as can be seen into the ORC worldwide map [1]. Waste heat recovery is provided by ORC technology that has being developed over the last 30 years. The first one is working fluid selection and thermodynamic optimization of an ORC cycle at design and part-load operation. The second one is ORC expansion units improvement arising from their current low efficiency due to high Mach numbers and complex organic fluids behavior [2, 3]. Plenty of novel mediums have appeared over the last decade, like siloxanes and zeotropic mixtures, which can provide significant increase of a cycle efficiency up to 20-25% [4, 5], fluid selection is important part of a plant design
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